Before they BOTH went to rehab, Charlie Sheen and his wife Brooke Mueller were back to some of their old — and dangerous — habits. Radar Online reports that Brooke, who had already been in and out of rehab in January, was drinking and partying ” right before” she went into rehab in Malibu on Feb. 16.

Actually, “the two often partied heavily [together] during the past months,” the site reports. As HollywoodLife.comtold you in January, Brooke and Charlie’s Christmas argument was related to substance abuse and was more about Brooke’s partying than anything else.

Radar Online says Charlie “has been heading down a slippery slope headed toward his old life of addiction,” and quotes a source as saying, “The one thing he and Brooke have in common is their love to party. They’re the Toxic Twins.” Charlie is also now in rehab, in an unknown location, for the third time.

But the twins we are obviously MOST concerned about are Max and Bob, the couple’s 11-month-old babies. Thankfully, as we learned from Lisa Rinna, they are being watched by a nanny. But we hope these two get their acts together and get home to their little ones soon!